DifWind Ltd II wind project was installed in California, USA It was completed in 1986 and is owned by EDF Energies Nouvelles.
It is near San Gorgonio.
See below for data.
Typically, economic wind machines require a wind speed of 4.5 m/s (16 km/h) or higher.
The best location for something similar to DifWind Ltd II is a steady availability of non-turbulent wind. An essential aspect of turbine siting is furthermore access to local demand or transmission capaSan Gorgonio.
Before development, DifWind Ltd II was probably screened on the basis of a wind atlas, and validated with wind specifications. However, DifWind Ltd II wind farm would have needed more than just meteorological data and measurements.
Collection of site-specific data for wind speed and direction would have been essential to determining site potential as a way to fund the project. Local winds are frequently monitored for a year or more, and detailed wind maps constructed before wind generators are set up.
The wind blows quicker at greater altitudes because of the reduced influence of drag. The rise in velocity with altitude is most extraordinary near the surface and is impacted by geography, surface roughness, and upwind obstructions such as trees or buildings. Velocity boosts with altitude and it is more obvious near land and is changed by landscape, surface and limitations.
Typically, the rise of wind speeds with raising height follows a wind profile power law, which predicts that wind speed rises proportionately to the seventh root of altitude. Doubling the altitude of a turbine, then, raises the expected wind speeds by 10%, and the predicted power by 34%.
The distance of 7x Rotor Diameter is placed between each turbine, ie they’re spaced out so that they don’t affect one another. However this is not always the situation in hilly areas.
Individual turbines at DifWind Ltd II are connected with a medium voltage (usually 34.5 kV) power collection system and communications network.
At a substation, this medium-voltage electric current is improved in voltage with a transformer for link with the high voltage transmission system. Construction of a land-based wind farm requires installation of the collector system and substation, and probably access roads to each and every turbine site.